Concrete mixer



B. B. COLLlNGS CONCRETE MIXER June 24, 1930,

2 Sheets-Sheet Filed Dec. 15, 1928 INVENTOR.

2 Sheets-Sheet 2 Filed Dec. 13, 1928 ATE'ORNEEQ" Patented June 24, 193% UNITED fi l tl litl BYRGN B. GOLLINGS, or wasrirneron, nrsrnro'r or coturcnia, AssrG-Ncn T CHAIN BELT corrPAn-Y, or IvTILit/AUKEE, Wisconsin, a oonronnrron or VIISCONSIN concn irr'n Application filed December 18, 19281 This invention relates to concrete mixers and more particularly to the loading skips of such mixers and has for one of its objects to provide a simple and eli'ective construc- .ti'on whereby the radius of swing of the loading skip may be varied during the movement of the skip to and from charging position. v

In concrete miners of the type provided with pivoted loading skips which poweractuated, it is desirable during the initial movement of the skip from its position on the ground to have a relatively long radius of swing, inasmuch as at this time the weight of the load of aggregates is exerting a maximum downward pressure which must be overcome by the engine or other prime mover which is doing the'elevating. As the skip approaches its upper limit of swing, however, at which point its contents are discharged into the mixing drum, it is de sirable to shorten up the radius of swing since the load is in motion, and by shortening the said radius it is possible to increase the speed of the skip whereby the discharge of the materials is facilitated when the skip is suddenly brought to a standstill in its discharging position.

It is the primary object of the present invention to provide a means for effecting this change of the radius ofthe skips swing,-

which means will be simple in construction, comparatively inexpensive to manufacture and install and more efiicient in use than those which have been heretofore proposed.

With the above and other objects in view, which will appear as the description proceeds, the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the appended claims.

Referring to the accompanying drawings forming a part of this-specification in which like'reference characters desigi'iate like part in all the views:

Fig. 1 is a side elevational view of one form of concrete mixer showing the present invention applied thereto.

Fig. 2 is an enlarged fragmentary secfierial 3310. 825,858.

tional view taken approximately on the plane indicated by the line 22 of Fig. 1, looking down.

Figs. 3 and are enlarged fragmentary side elevational views illustrating in detail several positions of the parts, and

Figs. 5 and (5 are similar views showing a slightly modified form of the invention.

In the said drawings there is shown diagrammatically a concrete mixer, comprising a framework 10, in which is mounted the usual mining drum l1 and a charging skip 12 for said drum which is adapted to be elevated by means of the cable 18 and winding drum 14., which litteris preferably power-driven in the well known manner. The skip 12 has a pair of projecting arms 15, which are provided at their free ends with rollers 16, which rollers are received. in slots 17 formed in guide members 18, supported in any suitable manner on the frame 10. A transverse rod or shaft 19' is also mounted in the frame 10, and pivotally carries a pair of links 20 which are pivotally connected at their other ends as by the studs 21 to the skip arms 15.

The slots 17, formed in the guide members 18, comprise a short horizontal portion 22, which merges into a downwardly extending arcuate portion 23, which arcuate 30 portion is struck from a predetermined point located in the path of travel of the pivot stud 21, which path is indicated by the broken line 25.

The operation of the device is as follows:

With the parts in the positions illustrated in F 1 and 3, and the skip 12 loaded with aggregates on power being applied to the hoisting cable 13, the skip will be raised pivoting on the roller 16. Under the influence of the link 20, however, which is connected to the frame eccentrically from the roller 16, the said roller will move slightly toward the right, as viewed in Fig. 3, until the link 20 reaches a horizontal position. As the link 20 is raised from the horizontal through continued upward movement of the skip, the'roller 16 will reverse its motion and move toward the left, as viewed in Fig. 3, until it reaches the dotted line position il- 10o lustrated in Fig. 4, wherein the roller has reached the junction of the straight portion 22 of the slot 17 with the curved portion 2 This occurs at the time when the pivot 2L between the link 20 and the arm 15 has r ached the point .24 in its path of travel and any further movement of the skip will occur without additional movement of the link, since. as above explained, the arcuate portion 23 of the slot 17 is struck from the point 2t as a center. The skip I) will therefore move from the dotted line position, illustrated in Fig. 4. to the full line position shown therein about the pivots 21, with the result that during this last portion of the discharging movement oi: the skip such movement will be about a lesser radius of swing than was the initial portion of such movement.

The decreasing of this radius, of course. produces an increased speed in the travel of the skip. with the result that when the skip is stopped in the position shown in full lines in Fig. 4 the contents thereof are effectively jarred to complete the discharge thereof into the mixing drmn 11.

The modified constructiijin illustrated in Figs. 5 and 6 is quite similar to that above disclosed. The skip arms are again pivoted to the links .20, at the points 21, and the said links are in turn pivoted to the frame by the transverse shaft 19. The free ends of the skip arms are preferably turned downwardly as indicated at and carry the rollers 16, which work in the slots 31 of the guide members In this case the slots -31 comprise two portions and 31. the former of which is an arc struck from the center of the shaft 19, while the latter is a lateral projection therefrom extending from the uppe:- end of the portion 313.

In the operation of this form, the skip is raised, the arms 15 tend to pivot about the pins 21. which tendency, however, will be resisted by the roller 16. hearing against the left hand face of the lower portion 33 of slot 31. which in effect locks the arms 15 with the links 20 whereby the entire assembly is raised, pivoting about the shaft 19. This motion continues until the parts have reached the dotted line position illustrated in Fig. (5, wherein the roller 16 has reached the junc tion between the portions and kit of the slot 31. and any further movement of the skip will cause the said roller to enter the laterally )rojecting portion 34, with the. tosult that rom the dotted line position shown in Fig. 6 to the full line position shown therein the arms 15 of the skip will perform a compound, pivotal movement about both the shaft 19 and the pivots Q1. The effective radius of swing of the skip. however, is again materially lessened. with a consequent increase in the speed ot the skip during the latter portion of its upward travel.

It is obvious that those skilled in the art may vary the details of construction, as well as the precise arrangement of parts, without departing from the spirit of the invention, and therefore it not wished to be limited to the above disclosure except as may be required by the claims.

Vhat claimed is:

1. In a charging device for concrete mixers having a frame and a. mixing receptacle mounted thereon, the combination of a charging skip having an arm; means for raising and lowering said skip; a link pivotally connected to said frame and to said arm; and a guide having two connected portions disposed at an angle to one another, one of said portions guiding said arm during the first: part of the upward movement of said skip, and the other portion guiding said arm during the latter part of said skip n'iovement.

2. In a charging device for concrete mixers having a frame and a mixing receptacle mounted thereon, the combination of a charging skip having an arm; means for raising and lowering said skip; a link pivotally connected to said frame and to said arm intermediate its end and its point of attachment to said skip; and a guide having a substantially horizontal portion, and a second portion extending at an angle therefrom, the free end of said arm floating in one portion of said guide during the first part of the upward movement of said skip, and in the other portion of said guide during the latter part of. said skip movement. 7

3. In a charging device for concrete mixers having a frame and av mixing receptacle mounted thereon, the combination of a charging skip having a. projecting arm; means for raising and lowering said skip; a link pivotally connected to said frame and to said arm; and a guide for the free end of said arm, said guide having a straight portion for guiding said arm during the major part of the upward movement of. said skip, and a curved portion for guiding said arm during the remainder of said skip movement.

In a charging device I or concrete mix ers having a frame and a mixing receptacle mounted thereon, the combination of a charging skip having an arm; means for raising and lowering said skip; a link pivotally connected to said frame and to said arm intermediate its end and its point of attaclnnent to said skip; and a. guide having a substantially straight horizontal portion and a downwardly curved portion extending therefrom, the free end of said arm floating in said straight horizontal portion during the first part of the upward movement of the skip, and in the downwardly extending curved portion during the latter part of said skip movement.

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5. In a charging device for concrete mixers having a frame and a mixing receptacle mounted thereon, the combination of a charging skip having a projecting arm; means for raising and lowering said skip; a link pivotally connected to said frame and to said arm intermediate its end and its point of attachment to said skip; and a guide for the free end of said arm, said guide having a straight portion and a curved portion, the latter portion being formed on an arc struck from a center located at a predetermined point in the path of travel of the pivot between said arm and link.

In testimony whereof I affix my signature.

BYRON B. COLLINGS. 

